Newsletter September 2014
Dear colleagues and friends of the HI Jena,
Welcome to the September issue of the newsletter of the HI Jena.
We hope you had a nice pleasant summer time. Below you find news about recent activities and the latest publications of our institute.
Helmholtz Institute Jena
Research news and developments
Interaction of relativistic electron vortex beams with few-cycle laser pulses
The physics of vortex beams is a new and very rapidly developing research field that covers diverse topics, such as optics, quantum information or materials science. An intriguing feature of vortex beams is that they possess a non-zero orbital angular momentum (OAM) along their direction of propagation. This fundamentally new degree of freedom for (freely) propagating beams gives rise to corkscrew-like wavefronts that results in a vortex-type intensity distribution of the beam. Therefore, vortex beams are known to have a phase singularity (sometimes called a wave dislocation) at their center with zero intensity and where the phase remains undetermined. Such twisted beams of light have been discovered theoretically in the beginning of 1990s and have been explored since then, first for optical beams and more recently also for electrons. Moreover, electron vortex beams have been utilized in order to improve the microscope scanning of complex systems, such as magnetic materials and biological specimens.
A natural and frequently arising question is: How can one control and manipulate the properties of electron vortex beams by means of a laser light? To answer this question, we have studied recently the interaction of relativistic electron vortex beams with laser pulses. In this work, which have meanwhile been published in Phys. Rev. Lett. , emphasis was placed on a special type of Bessel beams and how they interact in head-on collision with linearly polarized laser pulses (cf. the sketch on Fig. 1). For such a collinear-beam scenario, exact analytical solutions have been worked out for the Dirac equation and for laser-driven relativistic electrons with twisted wavefronts. For this, we have generalized the recently constructed Bessel-type solutions of the Dirac equation for field-free electrons . Furthermore, it was shown that our newly derived Volkov-Bessel solutions contain the well-known Dirac-Volkov solutions for a zero OAM, i.e. if the ``twistedness'' of the electron beam is switched off. Although our Volkov-Bessel solutions are general and can be applied for any linearly polarized laser pulses, a detailed numerical analysis was performed especially for few-cycle laser pulses with femtosecond duration.
For a beam of relativistic twisted electrons, the spin angular momentum is implicitly contained within the Dirac equation. For these electrons, therefore, both the orbital and spin angular momentum components gives rise to a (so-called) intrinsic spin-orbit coupling inside the freely evolving electron vortex beams . This type of coupling, sometimes refered to as spin-to-orbit conversion, leads to small spin-dependent splitting of various observables, such as the beam intensity in the transverse direction as shown in Fig. 1. The left (``+'') and right (``-'') density plots of this Figure display the ``spin-up'' and ``spin-down'' states of the twisted electron. Apart from the intrinsic spin-orbit interaction, moreover, we have shown that the electron beam also experiences an intrinsic orbit-orbit interaction between its longitudinal OAM projection and the OAM-components of the plane wave laser field. Both, the intrinsic spin-orbit and the orbit-orbit interactions manifest themselves in the interaction of twisted electrons with laser beams. With these interactions, for example, it becomes possible to control the electron beam profile via both, the spin- and time-dependent spatial shift of the beam center with regard to the center of the initially field-free beam. Such a dynamical shift enables one to manipulate the dislocation of the electron beam by tuning the laser field [cf. Fig. 1].
This work has been carried out by the groups at Heidelberg University and the Helmholtz Institute Jena, and in collaboration with Dr. Andrea Aiello from the Max-Planck Institute for Science of Light in Erlangen. Our solutions open new routes for studying electron vortex beams in external light fields and to explore these beams within the paraxial domain as well as for future experiments in the non-paraxial regime.
 A.G. Hayrapetyan, O. Matula, A. Aiello, A. Surzhykov and S. Fritzsche, Phys. Rev. Lett. 112, 134801 (2014).
 K.Y. Bliokh, M.R. Dennis and F. Nori, Phys. Rev. Lett. 107, 174802 (2011).
News and Announcements
The HI Jena is proud to host the 9. International Conference on Atomic and Molecular Data and Their Applications, to take place from September, 21st to 25th in Hörsaal 1, Abbeanum.
ICAMDATA 2014 is continuing the series of international conferences to promote the use of atomic and molecular data in various fields of science and technology, and provides a forum for the interaction of data producers, database designers and compilers, and data users. The conference focuses on the topics:
- I. Applications of and needs for atomic and molecular data
- II. Atomic and molecular data collections, assessment and dissemination
- III. Experimental and theoretical atomic and molecular data generation
More information: http://www.icamdata.uni-jena.de/
The setup of CRYRING@ESR started in renovated Cave B at GSI
The twelve dipoles that form the low energy storage ring CRYRING@ESR have been installed in their place. The final steps of the infrastructural work at the CRYRING cave are in progress. The picture shows about half of the storage ring, with the fork lift just about to position the height-adjusted frame for supporting a switching dipole of the two injector beamlines, delivering beams either from a local ion source or from ESR. The installation of the power converter and associated electronics is also ongoing so that we are optimistic to start commissioning of the local source end of this year and of the ring in the middle of next year.
Frank Herfurth und Michael Lestinsky
Guests of the institute
Dr. Rashid Shaisultanov (Nazarbayev University, Kazakhstan) visited the HI Jena from September 1st to 20th to collaborate on topics in strong field QED.
11th Topical Workshop of the SPARC Collaboration
Conference center, Worms, Germany
The Workshop is organized by the SPARC Collaboration, GSI Helmholtzzentrum für Schwerionenforschung. and Helmholtz Institut Jena. It is a satellite meeting to the International Conference of Science and Technology for FAIR in Europe which will be held in Worms, Germany.
The SPARC Collaboration is an international platform for advanced research in atomic physics with highly charged ions, established in 2002-2003 in connection with the Facility for Antiprotons and Ions (FAIR), currently under construction at GSI, Darmstadt.
During this Workshop the main SPARC collaboration activities will be discussed: the physics Programme of the Modular Start Version/Day-one experiments, TDRs, status of the SPARC projects (experiments, detector development, civil construction), status of the SPARC relevant facilities at FAIR (HESR, CRYRING, APPA cave and HITRAP), funding and time line.
More information: https://www.gsi.de/sparc
Second Joint Lecture Week of RS-APS and HGS-HIRe
Schloss Buchenau, 36132 Eiterfeld-Buchenau
This lecture week will be organized by the HI-Jena in cooperation with HGS-HIRe.
Topic: X-ray spectroscopy as diagnostic tool in atomic and plasma physics
Ultrafast fluorescence spectroscopy for axial resolution of flurorophore distributions
M. Gräfe, A. Hoffmann, and C. Spielmann
Appl. Phys. B 117, 833 (2014)
Observation of Coherence in the Time-Reversed Relativistic Photoelectric Effect
S. Tashenov, D. Banaś, H. Beyer, C. Brandau, S. Fritzsche, A. Gumberidze, S. Hagmann, P.-M. Hillenbrand, H. Jörg, I. Kojouharov, Ch. Kozhuharov, M. Lestinsky, Yu. A. Litvinov, A. V. Maiorova, H. Schaffner, V. M. Shabaev, U. Spillmann, Th. Stöhlker, A. Surzhykov, and S. Trotsenko
Phys. Rev. Lett. 113, 113001 (2014)
Observation of the hyperfine transition in lithium-like bismuth 209Bi80+ : Towards a test of QED in strong magnetic fields
M. Lochmann, R. Jöhren, C. Geppert, Z. Andelkovic, D. Anielski, B. Botermann, M. Bussmann, A. Dax, N. Frömmgen, M. Hammen, V. Hannen, T. Kühl, Y. Litvinov, R. Lopez-Coto, T. Stöhlker, R. Thompson, J. Vollbrecht, A. Volotka, C. Weinheimer, W. Wen, E. Will, D. Winters, R. Sanchez, and W. Nörtershäuser
Phys. Rev. A 90, 030501 (2014)
Realizing a laser-driven electron source applicable for radiobiological tumor irradiation
M. Nicolai, A. Sävert, M. Reuter, M. Schnell, J. Polz, O. Jäckel, L. Karsch, M. Schürer, M. Oppelt, J. Pawelke, and M. C. Kaluza
Appl. Phys. B 116, 643 (2014)
Test of Time Dilation Using Stored Li+ Ions as Clocks at Relativistic Speed
B. Botermann, D. Bing, C. Geppert, G. Gwinner, T. Hänsch, G. Huber, S. Karpuk, A. Krieger, T. Kühl, W. Nörtershäuser, C. Novotny, S. Reinhardt, R. Sanchez, D. Schwalm, T. Stöhlker, A. Wolf, and G. Saathoff
Phys. Rev. Lett. 113, 120405 (2014)
Laser photon merging in an electromagnetic field inhomogeneity
H. Gies, F. Karbstein, and R. Shaisultanov
Phys. Rev. D 90, 033007 (2014)
Phase structure of many-flavor QED₃
J. Braun, H. Gies, L. Janssen, and D. Roscher
Phys. Rev. D 90, 036002 (2014)
Temporal contrast control at the PHELIX petawatt laser facility by means of tunable sub-picosecond optical parametric amplification
F. Wagner, C. João, J. Fils, T. Gottschall, J. Hein, J. Körner, J. Limpert, M. Roth, T. Stöhlker, and V. Bagnoud
Appl. Phys. B 116, 429 (2014)
Spectroscopic characterization of Yb3+-doped laser materials at cryogenic temperatures
J. Körner, V. Jambunathan, J. Hein, R. Seifert, M. Loeser, M. Siebold, U. Schramm, P. Sikocinski, A. Lucianetti, T. Mocek, and M. C. Kaluza
Appl. Phys. B 116, 75 (2014)
Characterization of a broadband interferometric autocorrelator for visible light with ultrashort blue laser pulses
M. Zürch, A. Hoffmann, M. Gräfe, B. Landgraf, M. Riediger, and Ch. Spielmann
Opt. Commun. 321, 28 (2014)
High precision elimination of angular chirp in CPA laser systems with large stretching factors or high bandwidth
R. Bödefeld, M. Hornung, J. Hein, and M. C. Kaluza
Appl. Phys. B 115, 419 (2014)
Full characterization of the amplified spontaneous emission from a diode-pumped high-power laser system
S. Keppler, M. Hornung, R. Bödefeld, A. Sävert, H. Liebetrau, J. Hein, and M. C. Kaluza
Opt. Express 22, 11228 (2014)
Spectral broadening and compression of sub-millijoule laser pulses in hollow-core fibers filled with sulfur hexafluoride
A. Hoffmann, M. Zürch, M. Gräfe, and C. Spielmann
Opt. Express 22, 12038 (2014)
Electron-Ion Equilibration in Ultrafast Heated Graphite
T. G. White, N. J. Hartley, B. Borm, B. J. B. Crowley, J. W. O. Harris, D. C. Hochhaus, T. Kaempfer, K. Li, P. Neumayer, L. K. Pattison, F. Pfeifer, S. Richardson, A. P. L. Robinson, I. Uschmann, and G. Gregori
Phys. Rev. Lett. 112, 145005 (2014)
Apparatus and fast method for cancer cell classification based on high harmonic coherent diffraction imaging in reflection geometry
M. Zürch, S. Foertsch, M. Matzas, K. Pachmann, R. Kuth, and C. Spielmann
Proc. SPIE 9033, 1 (2014)
Pair production in rotating electric fields
A. Blinne, and H. Gies
Phys. Rev. D 89, 085001 (2014)
Parametric amplification of attosecond pulse trains at 11nm
J. Seres, E. Seres, B. Landgraf, B. Ecker, B. Aurand, A. Hoffmann, G. Winkler, S. Namba, T. Kuehl, and C. Spielmann
Sci. Rep. 4, 4254 (2014)
Shaping laser accelerated ions for future applications – The LIGHT collaboration
S. Busold, A. Almomani, V. Bagnoud, W. Barth, S. Bedacht, A. Blažević, O. Boine-Frankenheim, C. Brabetz, T. Burris-Mog, T. Cowan, O. Deppert, M. Droba, H. Eickhoff, U. Eisenbarth, K. Harres, G. Hoffmeister, I. Hofmann, O. Jäckel, R. Jäger, M. Joost, S. Kraft, F. Kroll, M. Kaluza, O. Kester, Z. Lecz, T. Merz, F. Nürnberg, H. Al-Omari, A. Orzhekhovskaya, G. Paulus, J. Polz, U. Ratzinger, M. Roth, G. Schaumann, P. Schmidt, U. Schramm, G. Schreiber, D. Schumacher, T. Stöhlker, A. Tauschwitz, W. Vinzenz, F. Wagner, S. Yaramyshev, and B. Zielbauer
Nucl. Instr. Meth. Phys. Res. A 740, 94 (2014)
Structure and fluorescence properties of ternary aluminosilicate glasses doped with samarium and europium
A. Herrmann, S. Kuhn, M. Tiegel, C. Russel, J. Korner, D. Klopfel, J. Hein, and M. Kaluza
J. Mater. Chem. C 2, 4328 (2014)